An engineer says this: "Looking at Acrobat DC msi file, BrandName property gets reset early in the sequence by the custom action SetBrandName, which essentially sets BrandName to the same value as ProductName. Not sure how this customer gets the result described. Did he actually changed ProductName property? Removed\Disabled custom action?"
Is there anything else you did? It would be good to verify this works without causing issues before a wider audience picks it up as a possibility.
Ben